Oiling attachment for intermittently-operated machines.



W. COTTRELL & R. B. BENJAMIN. OILING ATTACHMENT FOR INTEHMITTENTLY OPERATED MACHINES. APPLICATION FILED MAR. 2. m5.

Patented Nov. 20, 1917.

3 SHEETS-SHEET 1.

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I I Zin /222x25 W. COTTRELL & R. B. BENJAMIN.

OILING MTACHMENT FOR INTERMITTENTLY OPERATED MACHINES.

APPLICATION FILED MAR. 2. ms.

1,24 Patented Nov. 20, 1917.

3 SHEETS-SHEET 2.

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OILING ATTACHMENT FOR INTERMITTENTLY OPERATED MACHINES.

APPLICATION FILED MAR. 2.19I5.

Patented Nov. 20, 1917.

3 SHEETSSHEET 3.

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' ED STATES PATENT orricn.

WILLIAM COTTBELL AND REUBEN 1B. BENJAMIN, OF CHICAGO, ILLINOIS, ASSIGNOBS T0 BENJAMIN ELECTRIC MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A.

CORPORATION OF ILLINOIS.

Specification of Letters Patent.

Patented Nov. 20, 191 '7.

Application filed March 2, 1915. Serial No. 11,888.

To all whom it may concern:

Be it known that we, WILLIAM Go'rrREu. and REUBEN B. BENJAMIN, both citizens of the United States, and both reslding at Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvements in Oiling Attachments for Tntermittently-Operated Machines, of which the following is a full, clear, concise, and exact description, reference being had to the accompanfying drawing, formlng a part of this speci cation.

Our invention relates to oiling attachments for intermittently operated machines and, in its more specific aspect, to oiling attachments for use in connection with presses.

In punch press work it has been found advantageous to cover the surface of the material which is to be worked on with a coating of oil to keep the working edge of the tool lubricated. This coating has usually been applied manually by means of a brush dipped in oil. This method takes considerable time and requires a good deal of 011. Furthermore, it often. happens that after the coating has been applied the stock must he around for some time before it is operated on, in which case dust settles on the oiled surface forming a gum which tends to dull the edges of the tool.

Our invention has for one of its ObJGCtS to provide an improved oiling attachment for presses which will automatically coat the surface of the material to worked on as it is fed to the press, thereb effecting a saving in time and oil and preventing foreign material from collecting on the oiled surface before it is operated on. Further objects will appear from the detailed descrlp- In the accompanying drawings, in which we have illustrated one embodiment of our invention- Figure 1 is a front elevation of a punch press equipped with an air compressor driven from the crank shaft of the press and provided with our improved oiling attachment;

Fig. 2 is a side elevation of the parts shown in Fig. 1;

Fig. 3 is a central vertical section of the oil reservoir and the valve mechanism for controlling its flow to the spray nozzle;

Fig. 4 is. a detail view of part of the noz 1e; and r r 1g. 5 is a section on the line 55 of F1 3 showing a detail of the nozzle.

I ferring now to the drawin in detail reference character 1 indicates, in general, a punch press having the usual crank shaft 2 and ram 3 driven thereby. An air compressor 4 is operated from the crank shaft by means of a crank 5 which drives the connectlng rod 6. 7 indicates a storage tank for the compressed air to which is connected an air conduit leading to a valve 9 controlled by means of a pivoted arm 9" which is actuated by means of a roller 10 mounted on a pivoted link 11 carried by a vertically and angularly adjustable member 12 which is secured to the ram 3 by means of a bolt 14 extending through a slot 13 in the member 12. An air conduit 15 leads from the valve 9 to a nozzle 16 for the purpose of ejecting the work from the machine and keeping it free from dust, etc. A T-shaped pipe fitting 17 is located in the conduit 15. A pipe 18 leads forwardly from this T-shaped fitting to a pipe elbow 19. Piping 20 leads from the elbow 19 across the front of the press, to a second elbow 21, thence rearward to a T pipe coupling 22. A shut-off valve 23 is located in the piping 20 for the purpose of cutting off the oiling attachment from the air compressor when desired.

The oil supplying device comprises a reservoir 24, a fittlng 25 into which the reservoir 24 is screwed, and a needle valve 26 for controlling the flow of oil. The reservoir is provided with a s ring diaphragm forming a cap 27 and is re need and externally screw threaded at its lower end 28 where it engages the fitting 25. The diaphragm 27 is held in place by means of an annular flan ed member 29 having a threaded connectlon with the reservoir 24. A piece of tubing 30 is screwed into an opening 31 in the fitting 25 for the purpose of equalizing the pressure on the oil. The needle valve 26 is provided with a conical portion 32 which cooperates with a conical valve seat 33 at the lower end of the passage 34 in the fitting 25. The lower endof this fitting 25 ro ects downwardly into the T ipe coup in 22. The upper end of the nee le valve 26 1s enged as h9Wp at 36, and is plwided with a longitudinally extending bore 37 leading to lateral openings 38 in the sides of the enlar ed portion 36 The portion 36 has a threa ed engagement with the bushing 39 which is secured centrally in the diaphragm 27 to permit adjustment of the needle valve. A lock nut 40 is provided to hold the needle valve in adjusted position. A cap 41 is provided for the upper end of the needle valve to permit the reservoir 24 to be filled by removing the cap. The pipe section 42 is screwed into the lower end of the T pipe coupling 22.

The spray nozzle comprises a bushing 43 screwed into the lower end of the piping 42. This bushing has a central longitudinal opening 44 therein leading to a transversely extending opening 45. The lower end of the bushing 1s tapered as'at 46 and terminates in a double cone 47. A sleeve 48 is threaded over the bushing 43 and has a contracted throat portion 49 at its lower end which cooperates with the double cone 47 to regulate the spray of oil.

The operation of our improved device is as follows:

Assuming that the ram is in its upper position and the trip of the press is operated to cause the crank shaft 2 to rotate, during the descending movement of the mm the connecting rod 6 will be moved upwardly and the compressor will not force any air I into the conduit 8, also during the downward movement the roller 10 will ride over the arm 9 without actuating it due to the pivotal connection of the arm 11 with the member 13. As the upward movement of the ram commences the roller 10 will engage the pivoted arm 9 to open the valve and permit air to flow to the nozzle 16 and to the spray nozzle 22. On account of the restricted passage through the spray nozzle between the double cone 52 and the throat 54 air will be compressed to some extent in the piping 20, and this compression of the air will result in a compression of the air abovethe oil-in the reservoir 24 and below the spring diaphragm 27. This compression of air below the spring diaphragm will force the diaphragm upward slightly to lift the conical portion 32 of the needle valve away from the valve seat 33 to permit a small v quantity of oil to drip down into the T pipe couphng where it will be entrained with the air flowing downward to the nozzle and will be delivered through the nozzle in a fine spray to form a thin film of oil on the work which is being fed to'the pres's.

As previously stated, the amount. of oil which will be delivered when the valve 26 is lifted by the spring diaphra- 27 may be regulated by loosening the loc nut 40 and screwing the needle valve in or out with respect to the spring diaphragm to permit a more or less restricted passage between the conical portion 32 and the valve seat. To fill the receptacle 24 the cap 41 is removed and oil is poured into the passage 37 from whence it flows out through the openin s 38 into the reservoir. The tubing 30 whic extends upwardly through the oil in the reservoir 24 equalizes the pressure above and below the oil in the reservoir.

By screwing the sleeve 48 in or out with respect to the bushing 43 the form of the jet or spray of oil delivered by the nozzle may be varied to spread it over more or less of the surface of the material which is being fed to the press.

Having thus described our invention what we claim as new and desire to secure by Letters Patent is:

1. The combination with a press, of a source of intermittent air pressure, a conduit leading therefrom, an oil reservoir communicating with the said conduit, a valve for controlling said communication, and means for controlling said valve comprising a spring diaphragm exposed to said intermittent air pressure.

2. The combination with a press, of a source of intermittent air pressure, a conduit leading therefrom an oil reservoir communicating with the said conduit, a valve for controlling said communication, and means for controlling said valve comprising a. spring diaphragm exposed to said intermittent air pressure, said spring diaphragm also constituting a closure for said oil reservoir.

3. An oiling attachment for presses comprising an oil reservoir having an oil outlet, a needle valve controlling said outlet, and a spring diaphragm forming a closure for said reservoir connected to said valve for actuatin' I it.

4. An oilin attachment for presses comprising an oil reservoir having a threaded portion for connection with a pipe fitting,

witnesses.

WILLIAM COTTRELL. REUBEN 'B. BENJAMIN. Witnesses:

MARGARET Tmnnn, ANNE SOLOMON. 

